EP4465731A1 - Verfahren zum senden und empfangen eines downlink-steuerkanals und vorrichtung dafür - Google Patents

Verfahren zum senden und empfangen eines downlink-steuerkanals und vorrichtung dafür Download PDF

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Publication number
EP4465731A1
EP4465731A1 EP23740446.2A EP23740446A EP4465731A1 EP 4465731 A1 EP4465731 A1 EP 4465731A1 EP 23740446 A EP23740446 A EP 23740446A EP 4465731 A1 EP4465731 A1 EP 4465731A1
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EP
European Patent Office
Prior art keywords
dci
pieces
pdcch monitoring
pdcch
adaptation
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EP23740446.2A
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English (en)
French (fr)
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EP4465731A4 (de
Inventor
Sunghoon Lee
Suckchel Yang
Seonwook Kim
Jaehyung Kim
Seunggye Hwang
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LG Electronics Inc
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LG Electronics Inc
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Publication of EP4465731A1 publication Critical patent/EP4465731A1/de
Publication of EP4465731A4 publication Critical patent/EP4465731A4/de
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Definitions

  • the present disclosure relates to a method of transmitting and receiving a downlink control channel and apparatus therefor and, more particularly, to a method of monitoring a physical downlink control channel (PDCCH) based on at least one piece of downlink control information (DCI) that indicates PDCCH monitoring adaptation within an application delay for initiating the PDCCH monitoring adaptation and apparatus therefor.
  • PDCCH physical downlink control channel
  • DCI downlink control information
  • a future-generation 5th generation (5G) system is required to provide an enhanced wireless broadband communication, compared to the legacy LTE system.
  • 5G future-generation 5th generation
  • communication scenarios are divided into enhanced mobile broadband (eMBB), ultra-reliability and low-latency communication (URLLC), massive machine-type communication (mMTC), and so on.
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliability and low-latency communication
  • mMTC massive machine-type communication
  • eMBB is a future-generation mobile communication scenario characterized by high spectral efficiency, high user experienced data rate, and high peak data rate
  • URLLC is a future-generation mobile communication scenario characterized by ultra-high reliability, ultra-low latency, and ultra-high availability (e.g., vehicle to everything (V2X), emergency service, and remote control)
  • mMTC is a future-generation mobile communication scenario characterized by low cost, low energy, short packet, and massive connectivity (e.g., Internet of things (IoT)).
  • IoT Internet of things
  • the present disclosure aims to provide a method of transmitting and receiving a downlink control channel and apparatus therefor.
  • a method of receiving a physical downlink control channel (PDCCH) by a user equipment (UE) in a wireless communication system may include: receiving a plurality of pieces of downlink control information (DCI) for scheduling a plurality of physical downlink shared channels (PDSCHs), wherein each of the plurality of pieces of DCI includes a single field for PDCCH monitoring adaptation; receiving the plurality of PDSCHs based on the plurality of pieces of DCI; transmitting a plurality of pieces of hybrid automatic repeat request acknowledgment (HARQ-ACK) information for the plurality of PDSCHs; determining whether PDCCH monitoring adaptation indicated by at least one piece of DCI among the plurality of pieces of DCI is applied, based on a number of acknowledgments (ACKs) included in the plurality of pieces of HARQ-ACK information; and receiving the PDCCH based on the determination of whether the PDCCH monitoring adaptation is applied.
  • DCI downlink control information
  • HARQ-ACK hybrid automatic repeat request acknowledgment
  • the PDCCH monitoring adaptation may be applied for the reception of the PDCCH. Based on that at least one of the plurality of pieces of HARQ-ACK information is a negative acknowledgement (NACK), the PDCCH monitoring adaptation may not be applied for the reception of the PDCCH.
  • NACK negative acknowledgement
  • the PDCCH monitoring adaptation may be applied for the reception of the PDCCH. Based on all of the plurality of pieces of HARQ-ACK information are NACKs, the PDCCH monitoring adaptation may not be applied for the reception of the PDCCH.
  • the plurality of pieces of DCI may be received within an application delay of a first piece of DCI among the plurality of pieces of DCI.
  • All of the plurality of pieces of DCI may be intended to indicate identical PDCCH monitoring adaptation.
  • the plurality of pieces of DCI may be intended to indicate different PDCCH monitoring adaptation, and the PDCCH monitoring adaptation may be indicated by last received DCI among the plurality of pieces of DCI.
  • a UE configured to receive a PDCCH in a wireless communication system.
  • the UE may include: at least one transceiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations.
  • the operations may include: receiving a plurality of pieces of DCI for scheduling a plurality of PDSCHs through the at least one transceiver, wherein each of the plurality of pieces of DCI includes a single field for PDCCH monitoring adaptation; receiving the plurality of PDSCHs through the at least one transceiver based on the plurality of pieces of DCI; transmitting a plurality of pieces of HARQ-ACK information for the plurality of PDSCHs through the at least one transceiver; determining whether PDCCH monitoring adaptation indicated by at least one piece of DCI among the plurality of pieces of DCI is applied, based on a number of ACKs included in the plurality of pieces of HARQ-ACK information; and receiving the PDCCH through the at least one transceiver based on the determination of whether the PDCCH monitoring adaptation is applied
  • the PDCCH monitoring adaptation may be applied for the reception of the PDCCH. Based on that at least one of the plurality of pieces of HARQ-ACK information is a NACK, the PDCCH monitoring adaptation may not be applied for the reception of the PDCCH.
  • the PDCCH monitoring adaptation may be applied for the reception of the PDCCH. Based on all of the plurality of pieces of HARQ-ACK information are NACKs, the PDCCH monitoring adaptation may not be applied for the reception of the PDCCH.
  • the plurality of pieces of DCI may be received within an application delay of a first piece of DCI among the plurality of pieces of DCI.
  • All of the plurality of pieces of DCI may be intended to indicate identical PDCCH monitoring adaptation.
  • the plurality of pieces of DCI may be intended to indicate different PDCCH monitoring adaptation, and the PDCCH monitoring adaptation may be indicated by last received DCI among the plurality of pieces of DCI.
  • a base station configured to transmit a PDCCH in a wireless communication system in a wireless communication system.
  • the BS may include: at least one transceiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations.
  • the operations may include: transmitting a plurality of pieces of DCI for scheduling a plurality of PDSCHs through the at least one transceiver, wherein each of the plurality of pieces of DCI includes a single field for PDCCH monitoring adaptation; transmitting the plurality of PDSCHs through the at least one transceiver based on the plurality of pieces of DCI; receiving a plurality of pieces of HARQ-ACK information for the plurality of PDSCHs through the at least one transceiver; determining whether PDCCH monitoring adaptation indicated by at least one piece of DCI among the plurality of pieces of DCI is applied, based on a number of ACKs included in the plurality of pieces of HARQ-ACK information; and transmitting the PDCCH through the at least one transceiver based on the determination of whether the PDCCH monitoring adaptation is applied.
  • a method of transmitting a PDCCH by a BS in a wireless communication system may include: transmitting a plurality of pieces of DCI for scheduling a plurality of PDSCHs, wherein each of the plurality of pieces of DCI includes a single field for PDCCH monitoring adaptation; transmitting the plurality of PDSCHs based on the plurality of pieces of DCI; receiving a plurality of pieces of HARQ-ACK information for the plurality of PDSCHs; determining whether PDCCH monitoring adaptation indicated by at least one piece of DCI among the plurality of pieces of DCI is applied, based on a number of ACKs included in the plurality of pieces of HARQ-ACK information; and transmitting the PDCCH based on the determination of whether the PDCCH monitoring adaptation is applied.
  • an apparatus configured to receive a PDCCH in a wireless communication system, the apparatus comprising: at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: receiving a plurality of pieces of DCI for scheduling a plurality of PDSCHs, wherein each of the plurality of pieces of DCI includes a single field for PDCCH monitoring adaptation; receiving the plurality of PDSCHs based on the plurality of pieces of DCI; transmitting a plurality of pieces of HARQ-ACK information for the plurality of PDSCHs; determining whether PDCCH monitoring adaptation indicated by at least one piece of DCI among the plurality of pieces of DCI is applied, based on a number of ACKs included in the plurality of pieces of HARQ-ACK information; and receiving the PDCCH based on the determination of whether the PDCCH monitoring adaptation is applied.
  • a computer-readable storage medium comprising at least one computer program that causes at least one processor to perform operations.
  • the operations may include: receiving a plurality of pieces of DCI for scheduling a plurality of PDSCHs, wherein each of the plurality of pieces of DCI includes a single field for PDCCH monitoring adaptation; receiving the plurality of PDSCHs based on the plurality of pieces of DCI; transmitting a plurality of pieces of HARQ-ACK information for the plurality of PDSCHs; determining whether PDCCH monitoring adaptation indicated by at least one piece of DCI among the plurality of pieces of DCI is applied, based on a number of ACKs included in the plurality of pieces of HARQ-ACK information; and receiving the PDCCH based on the determination of whether the PDCCH monitoring adaptation is applied.
  • the operations of a user equipment may be defined when physical downlink control channel (PDCCH) monitoring adaptation is indicated to the UE through a plurality of pieces of downlink control information (DCI).
  • PDCCH physical downlink control channel
  • DCI downlink control information
  • the UE may perform PDCCH monitoring without any issues.
  • the methods of configuring/indicating/setting PDCCH monitoring adaptation through a plurality of pieces of DCIs proposed in the present disclosure may be performed by the UE independently or in combination.
  • the UE may also perform operations defined in the conventional NR standards while reducing unnecessary power consumption based on indicated PDCCH monitoring adaptation within a discontinuous reception (DRX) active time.
  • DRX discontinuous reception
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented as a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be implemented as a radio technology such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented as a radio technology such as institute of electrical and electronics engineers (IEEE) 802.11 (wireless fidelity (Wi-Fi)), IEEE 802.16 (worldwide interoperability for microwave access (WiMAX)), IEEE 802.20, evolved UTRA (E-UTRA), and so on.
  • IEEE institute of electrical and electronics engineers
  • Wi-Fi wireless fidelity
  • WiMAX worldwide interoperability for microwave access
  • WiMAX wireless fidelity
  • E-UTRA evolved UTRA
  • UTRA is a part of universal mobile telecommunications system
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA
  • LTE-advanced (LTE-A) is an evolution of 3GPP LTE.
  • 3GPP new radio or new radio access technology (NR) is an evolved version of 3GPP LTE/LTE-A.
  • NR new radio access technology
  • enhanced mobile broadband eMBB
  • massive machine type communication mMTC
  • ultra-reliable and low latency communications URLLC
  • KPI key performance indicator
  • eMBB goes far beyond basic mobile Internet access and covers rich interactive work, media and entertainment applications in the cloud or augmented reality (AR).
  • Data is one of the key drivers for 5G and in the 5G era, we may for the first time see no dedicated voice service.
  • voice is expected to be handled as an application program, simply using data connectivity provided by a communication system.
  • the main drivers for an increased traffic volume are the increase in the size of content and the number of applications requiring high data rates.
  • Streaming services (audio and video), interactive video, and mobile Internet connectivity will continue to be used more broadly as more devices connect to the Internet. Many of these applications require always-on connectivity to push real time information and notifications to users.
  • Cloud storage and applications are rapidly increasing for mobile communication platforms. This is applicable for both work and entertainment.
  • Cloud storage is one particular use case driving the growth of uplink data rates.
  • 5G will also be used for remote work in the cloud which, when done with tactile interfaces, requires much lower end-to-end latencies in order to maintain a good user experience.
  • Entertainment for example, cloud gaming and video streaming, is another key driver for the increasing need for mobile broadband capacity. Entertainment will be very essential on smart phones and tablets everywhere, including high mobility environments such as trains, cars and airplanes.
  • Another use case is AR for entertainment and information search, which requires very low latencies and significant instant data volumes.
  • 5G is one of areas that play key roles in enabling smart city, asset tracking, smart utility, agriculture, and security infrastructure.
  • URLLC includes services which will transform industries with ultra-reliable/available, low latency links such as remote control of critical infrastructure and self-driving vehicles.
  • the level of reliability and latency are vital to smart-grid control, industrial automation, robotics, drone control and coordination, and so on.
  • 5G may complement fiber-to-the home (FTTH) and cable-based broadband (or data-over-cable service interface specifications (DOCSIS)) as a means of providing streams at data rates of hundreds of megabits per second to giga bits per second.
  • FTTH fiber-to-the home
  • DOCSIS data-over-cable service interface specifications
  • VR and AR applications mostly include immersive sport games.
  • a special network configuration may be required for a specific application program.
  • game companies may have to integrate a core server with an edge network server of a network operator in order to minimize latency.
  • the automotive sector is expected to be a very important new driver for 5G, with many use cases for mobile communications for vehicles. For example, entertainment for passengers requires simultaneous high capacity and high mobility mobile broadband, because future users will expect to continue their good quality connection independent of their location and speed.
  • Other use cases for the automotive sector are AR dashboards. These display overlay information on top of what a driver is seeing through the front window, identifying objects in the dark and telling the driver about the distances and movements of the objects.
  • wireless modules will enable communication between vehicles themselves, information exchange between vehicles and supporting infrastructure and between vehicles and other connected devices (e.g., those carried by pedestrians).
  • Safety systems may guide drivers on alternative courses of action to allow them to drive more safely and lower the risks of accidents.
  • the next stage will be remote-controlled or self-driving vehicles.
  • Smart cities and smart homes often referred to as smart society, will be embedded with dense wireless sensor networks.
  • Distributed networks of intelligent sensors will identify conditions for cost- and energy-efficient maintenance of the city or home.
  • a similar setup may be done for each home, where temperature sensors, window and heating controllers, burglar alarms, and home appliances are all connected wirelessly.
  • Many of these sensors are typically characterized by low data rate, low power, and low cost, but for example, real time high definition (HD) video may be required in some types of devices for surveillance.
  • HD high definition
  • a smart grid interconnects such sensors, using digital information and communications technology to gather and act on information. This information may include information about the behaviors of suppliers and consumers, allowing the smart grid to improve the efficiency, reliability, economics and sustainability of the production and distribution of fuels such as electricity in an automated fashion.
  • a smart grid may be seen as another sensor network with low delays.
  • the health sector has many applications that may benefit from mobile communications.
  • Communications systems enable telemedicine, which provides clinical health care at a distance. It helps eliminate distance barriers and may improve access to medical services that would often not be consistently available in distant rural communities. It is also used to save lives in critical care and emergency situations.
  • Wireless sensor networks based on mobile communication may provide remote monitoring and sensors for parameters such as heart rate and blood pressure.
  • Wireless and mobile communications are becoming increasingly important for industrial applications. Wires are expensive to install and maintain, and the possibility of replacing cables with reconfigurable wireless links is a plausible opportunity for many industries. However, achieving this requires that the wireless connection works with a similar delay, reliability and capacity as cables and that its management is simplified. Low delays and very low error probabilities are new requirements that need to be addressed with 5G.
  • logistics and freight tracking are important use cases for mobile communications that enable the tracking of inventory and packages wherever they are by using location-based information systems.
  • the logistics and freight tracking use cases typically require lower data rates but need wide coverage and reliable location information.
  • the UE uses Discontinuous Reception (DRX) in RRC_IDLE and RRC_INACTIVE state in order to reduce power consumption.
  • DRX Discontinuous Reception
  • the UE performs a DRX operation according to DRX configuration information.
  • the UE When the UE operates based on the DRX, the UE repeats ON/OFF for reception. For example, when the DRX is configured, the UE attempts to receive/detect the PDCCH (e.g., PDCCH monitoring) only in a predetermined time interval (e.g., ON), and does not attempt to receive the PDCCH in the remaining time period (e.g., OFF/sleep).
  • the PDCCH e.g., PDCCH monitoring
  • a predetermined time interval e.g., ON
  • the remaining time period e.g., OFF/sleep
  • a time period during which the UE should attempt to receive the PDCCH is referred to as an On-duration, and this on-duration is defined once per DRX cycle.
  • the UE can receive DRX configuration information from a gNB through a RRC signaling and operate as the DRX through a reception of the (Long) DRX command MAC CE.
  • the DRX configuration information may be included in the MAC-CellGroupConfig.
  • the IE MAC-CellGroupConfig is used to configure MAC parameters for a cell group, including DRX.
  • DRX discontinuous Reception
  • a UE User Equipment
  • DRX can reduce power consumption by receiving a DL signal discontiguously.
  • the DRX operation is performed in a DRX cycle indicative of a time interval in which On Duration is periodically repeated.
  • the DRX cycle includes On Duration and sleep duration (or Opportunity for DRX).
  • the On Duration indicates a time interval in which a UE monitors a PDCCH in order to receive the PDCCH.
  • DRX may be performed in an RRC (Radio Resource Control)_IDLE state (or mode), an RRC_INACTIVE state (or mode), or an RRC_CONNECTED state (or mode).
  • RRC_IDLE state and the RRC_INACTIVE state DRX is used to receive a paging signal discontiguously.
  • DRX is basically divided into idle mode DRX, Connected DRX (C-DRX) and extended DRX.
  • DRX applied in the RRC IDLE state is called idle mode DRX
  • DRX applied in the RRC CONNECTED state is called Connected mode DRX (C-DRX).
  • eDRX Extended/enhanced DRX
  • SIB1 system information
  • the SIB1 may include an eDRX-Allowed parameter.
  • the eDRX-Allowed parameter is a parameter indicating whether idle mode extended DRX is permitted.
  • One paging frame is one radio frame which may include one or a plurality of paging occasions.
  • a UE may be configured to monitor only one PO per DRX cycle.
  • the PF, PO and/or PNB may be determined based on a DRX parameter provided via network signaling (e.g., system information).
  • 'PDCCH' may refer to MPDCCH, NPDCCH and/or normal PDCCH.
  • 'UE' may refer to MTC UE, BL (Bandwidth reduced Low complexity)/CE (coverage enhanced) UE, NB-IoT UE, Reduced Capability (RedCap) UE, normal UE and/or IAB-MT (mobile termination).
  • FIG. 1 is a flowchart showing an example of a method of performing an idle mode DRX operation.
  • a UE receives, from a base station, idle mode DRX configuration information through a higher layer signaling (e.g., system information) (S110).
  • a higher layer signaling e.g., system information
  • the UE determines a PF (Paging Frame) and a PO (Paging Occasion), for monitoring a physical downlink control channel (e.g., PDCCH) in a paging DRX cycle based on the idle mode DRX configuration information (S120).
  • the DRX cycle includes On Duration and sleep duration (or Opportunity for DRX).
  • the UE monitors a PDCCH in the PO of the determined PF (S130).
  • the UE monitors only one time interval (PO) for each paging DRX cycle.
  • the time interval may be a slot or a subframe.
  • the UE may transit to a connected mode and transmit or receive data with the base station.
  • a PDCCH more exactly, CRC of PDCCH
  • On Duration i.e., if paging is detected
  • ⁇ Idle state' a traffic (data) toward a UE in the RRC_Idle state
  • ⁇ Idle state' paging occurs toward the corresponding UE.
  • the UE wakes up every (paging) DRX cycle and monitors a PDCCH.
  • the UE transits to a connected state, and receives data. Otherwise, the UE may enter a sleep mode again.
  • C-DRX is DRX applied in the RRC connected state.
  • the DRX cycle of C-DRX may be configured as a short DRX cycle and/or a long DRX cycle.
  • the short DRX cycle is optional.
  • the UE When C-DRX is configured, the UE performs PDCCH monitoring during the On Duration. If a PDCCH is successfully detected during PDCCH monitoring, the UE activates an inactive timer and enter the awake state. On the other hand, if no PDCCH is successfully detected during PDCCH monitoring, the UE enters the sleep state after the end of the On Duration.
  • PDCCH reception occasions e.g., slots with PDCCH search spaces/candidates
  • PDCCH reception occasions may be discontinuously configured based on the C-DRX configuration.
  • PDCCH reception occasions e.g., slots with PDCCH search spaces/candidates
  • PDCCH monitoring may be restricted within a time duration set as a measurement gap, regardless of the C-DRX configuration.
  • FIG. 3 is a flowchart showing an example of a method of performing a C-DRX operation.
  • a UE receives, from a base station, RRC signalling (e.g., MAC-MainConfig IE) including DRX configuration information (S310).
  • RRC signalling e.g., MAC-MainConfig IE
  • the DRX configuration information may include the following information.
  • the UE restarts the drx-inactivity timer after successfully decoding a PDCCH for initial transmission only except for a PDCCH for retransmission.
  • an active time for a serving cell of a DRX group includes the following.
  • DRX 'ON' is configured through the DRX command of a MAC CE (command element) (S320)
  • the UE monitors a PDCCH for the ON duration of a DRX cycle based on the DRX configuration (S330).
  • FIG. 4 is a diagram showing an example of a C-DRX operation.
  • the UE when the UE receives scheduling information (e.g., DL assignment or UL grant) in the RRC_Connected state (hereinafter referred to as the connected state), the UE runs a DRX inactivity timer and an RRC inactivity timer.
  • scheduling information e.g., DL assignment or UL grant
  • the connected state when the UE receives scheduling information (e.g., DL assignment or UL grant) in the RRC_Connected state (hereinafter referred to as the connected state), the UE runs a DRX inactivity timer and an RRC inactivity timer.
  • a DRX mode starts.
  • the UE wakes up in a DRX cycle and monitors a PDCCH during a predetermined time (on duration timer).
  • Short DRX when the UE starts the DRX mode, the UE first starts in a short DRX cycle, and starts to a long DRX cycle after the short DRX cycle is terminated.
  • the Long DRX cycle is a multiple of the short DRX cycle.
  • the UE wakes up more frequently.
  • the RRC inactivity timer expires, the UE shifts to an idle state and performs an idle mode DRX operation.
  • FIG. 5 illustrates a DRX cycle.
  • the C-DRX operation has been introduced for power saving of the UE. If the UE receives no PDCCH within the on-duration defined for each DRX cycle, the UE enters the sleep mode until the next DRX cycle and does not perform transmission/reception.
  • the active time may continue (or increase) based on the operations of an inactivity timer, a retransmission timer, etc. If the UE receives no additional data within the active time, the UE may operate in the sleep mode until the next DRX operation.
  • a wake-up signal (WUS) has been introduced to obtain additional power saving gain in addition to the existing C-DRX operation.
  • the WUS may be to inform whether the UE needs to perform PDCCH monitoring within the on-duration of each DRX cycle (or a plurality of DRX cycles). If the UE detects no WUS on a specified or indicated WUS occasion, the UE may maintain the sleep mode without performing PDCCH monitoring in one or more DRX cycles associated with the corresponding WUS.
  • a PDCCH monitoring occasion for DCI format 2_6 may be determined by ps-Offset indicated by the network and a time gap reported by the UE.
  • the time gap reported by the UE may be interpreted as a preparation period necessary for an operation after the UE wakes up.
  • the base station may provide the UE with a search space (SS) set configuration capable of monitoring DCI format 2_6.
  • SS search space
  • DCI format 2_6 may be monitored in consecutive slots as long as the duration at the monitoring periodicity interval.
  • a monitoring window for monitoring DCI format 2_6 may be determined by the start time of the DRX cycle (e.g., a point where the on-duration timer starts) and ps-Offset configured by the BS.
  • PDCCH monitoring may not be required in the time gap reported by the UE. Consequently, an SS set monitoring occasion on which the UE actually performs monitoring may be determined as a first full duration (i.e., actual monitoring occasions of FIG. 6 ) within the monitoring window.
  • the UE may be informed by the BS whether the UE wakes up in the next DRX cycle.
  • SS set group switching and PDCCH monitoring skipping have been defined to reduce the power consumption of the UE.
  • the SS set group switching and PDCCH monitoring skipping are collectively defined as PDCCH monitoring adaptation.
  • the SS set group switching has been defined to reduce the power consumption of the UE.
  • the UE may be configured with a plurality of SS set groups, and an SS set group to be monitored by the UE among the plurality of SS set groups may be indicated.
  • the UE may monitor an SS set included in the corresponding SS set group according to the corresponding indication and skip monitoring of SS sets not included in the corresponding SS set group.
  • the UE may be provided with a list of SS set groups configured with a Type 3-PDCCH common search space (CSS) set and/or a user-specific search space (USS) set.
  • the UE may monitor SS sets corresponding to group index #0.
  • the UE may perform the SS set group switching operation depending on whether SearchSpaceSwitchTrigger is configured.
  • the UE may switch the SS set group according to the indication of DCI format 2_0.
  • the UE may start monitoring SS set group #0 after a predetermined time from the time when the UE receives DCI format 2_0 and stop monitoring SS set group #1.
  • the UE may start monitoring SS set group #1 after a predetermined time from the time when the UE receives DCI format 2_0 and stop monitoring SS set group #0. If the UE starts monitoring SS set group #1, the UE may start counting a timer configured by SearchSpaceSwitchTimer. If the timer expires, the UE may start monitoring SS set group #0 after a predetermined time from the time when the timer expires and stop monitoring SS set group #1.
  • the UE may change the SS set group based on DCI reception. For example, when the UE receives the DCI while monitoring SS set group #0 (or SS set group #1), the UE may start monitoring SS set group #1 (or SS set group #0) after a predetermined time from the time when the UE receives the DCI and stop monitoring SS set group #0 (or SS set group #1). In this case, the UE may start counting the timer configured by SearchSpaceSwitchTimer. If the timer expires, the UE may start monitoring SS set group #0 (or SS set group #1) after a predetermined time from the time when the timer expires and stop monitoring SS set group #1 (or SS set group #0).
  • the UE may start monitoring SS set group #0 (or SS set group #1) after the predetermined time from the time when the UE receives DCI format 2_0 as described above.
  • monitoring SS set group #0 (or SS set group #1) after the predetermined time may mean that monitoring of SS set group #0 (or SS set group #1) may start from the first slot (or applicable slot boundary) after at least P switch symbols from the last symbol of the PDCCH including the received DCI.
  • monitoring SS set group #0 (or SS set group #1) after the predetermined time may mean that monitoring of SS set group #0 (or SS set group #1) may start from the first slot in a group of specific slots after at least P switch symbols from the last symbol of the PDCCH including the received DCI. This is because the UE may need a prescribed time to decode the DCI, confirm the SS set group switching indication, and perform the SS set group switching operation actually.
  • P switch may be configured by RRC signaling.
  • SCS subcarrier spacing
  • u subcarrier spacing
  • the minimum P switch value may be defined as shown in [Table 1] below.
  • Minimum P switch value for UE processing capability 1 [symbols]
  • Minimum P switch value for UE processing capability 2 [symbols] 0 25 10 1 25 12 2 25 22
  • PDCCH monitoring skipping has been defined to reduce the power consumption of the UE.
  • the UE may be configured with a plurality of PDCCH monitoring skipping durations by an RRC parameter.
  • the plurality of PDCCH monitoring skipping durations may be configured at the slot level.
  • any one of the plurality of PDCCH monitoring skipping durations may be indicated to the UE in DCI, and the UE may skip PDCCH monitoring during the corresponding duration.
  • the UE may be instructed not to perform PDCCH monitoring skipping (i.e., no PDCCH monitoring skipping) in the DCI indicating the PDCCH monitoring skipping duration. If PDCCH monitoring skipping for a specific period is indicated by a PDCCH monitoring adaptation field of DCI, the UE may perform the PDCCH monitoring skipping from the beginning of the first slot after the last symbol of PDCCH reception including the corresponding DCI.
  • the UE When the UE is configured with a plurality of SS set groups and a plurality of PDCCH monitoring skipping durations through the RRC layer, and when the UE receives DCI including a PDCCH monitoring adaptation field, the UE may perform SS set group switching or PDCCH monitoring skipping according to the value of the corresponding PDCCH monitoring adaptation field.
  • each configurable value of the PDCCH monitoring adaptation field may be mapped to one SS set group or one PDCCH monitoring skipping duration.
  • the UE may perform switching to an SS set group corresponding to the corresponding PDCCH monitoring adaptation field value or stop PDCCH monitoring during a PDCCH monitoring skipping duration corresponding to the corresponding PDCCH monitoring adaptation field value.
  • the UE may not expect that a different value from the value of the PDCCH monitoring adaptation field included in the previously received DCI is indicated in the same specific slot.
  • the UE may not expect that a different value from the value of the PDCCH monitoring adaptation field included in the DCI received in the specific slot is indicated in a slot at least before P switch symbols from the specific slot. That is, the UE may expect that a different value from the value of the PDCCH monitoring adaptation field included in the DCI received in the specific slot is indicated in a slot at least after the P switch symbols from the specific slot.
  • FIG. 7 is a diagram illustrating a HARQ-ACK transmission timing, a PUSCH transmission timing, and an allocation method.
  • HARQ-ACK is information that indicates whether the UE has successfully received a physical downlink channel. If the UE has successfully received the physical downlink channel, the UE transmits an acknowledgement (ACK) as feedback to the BS. Otherwise, the UE transmits a negative ACK (NACK).
  • ACK acknowledgement
  • NACK negative ACK
  • HARQ supports 1-bit HARQ-ACK feedback per TB.
  • FIG. 7 is a diagram illustrating an exemplary HARQ-ACK timing (K1).
  • K0 represents the number of slots from a slot with a PDCCH carrying DL assignment (i.e., DL grant) to a slot with related PDSCH transmission
  • K1 represents the number of slots from a slot with a PDSCH to a slot with related HARQ-ACK transmission
  • K2 represents the number of slots from a slot with a PDCCH carrying a UL grant to a slot with related PUSCH transmission. That is, K0, K1, and K2 may be briefly summarized as shown in Table 2 below.
  • Table 2 A B K0 DL scheduling DCI Corresponding DL data transmission K1 DL data reception Corresponding HARQ-ACK K2 UL scheduling DCI Corresponding UL data transmission
  • the BS may provide a HARQ-ACK feedback timing to the UE dynamically via DCI or semi-statically via RRC signaling.
  • NR supports different minimum HARQ processing times among UEs.
  • the HARQ processing time includes a delay between a DL data reception timing and a related HARQ-ACK transmission timing as well as a delay between a UL grant reception timing and a related UL data transmission timing.
  • the UE transmits information on its capability regarding the minimum HARQ processing time to the BS. From the perspective of the UE, HARQ ACK/NACK feedback for multiple DL transmissions may be transmitted in a single UL data/control region in the time domain. The timing between DL data reception and related ACK transmission is indicated by DCI.
  • the NR system supports code block group based (CBG-based) transmission with single/multi-bit HARQ-ACK feedback.
  • a TB may be mapped to one or more code blocks (CBs) depending on the size of the TB. For example, during the channel coding process, a CRC code is attached to the TB. If the CRC-attached TB is not larger than a predetermined size, the CRC-attached TB corresponds to a single CB. However, if the CRC-attached TB is larger than the predetermined certain size, the CRC-attached TB is segmented into a plurality of CBs.
  • the UE may be configured to receive CBG-based transmission, and retransmission may be scheduled to carry a subset of all CBs in the TB.
  • the UE may detect a PDCCH in slot #n.
  • the PDCCH includes downlink scheduling information (e.g., DCI format 1_0 or 1_1) and indicates a DL assignment-to-PDSCH offset (K0) and a PDSCH-HARQ-ACK reporting offset (K1).
  • DCI format 1_0 or 1_1 may include the following information.
  • the UE may receive a PDSCH in slot #(n+K0) and then transmit UCI over a PUCCH in slot #(n+K1) based on the scheduling information in slot #n.
  • the UCI includes a HARQ-ACK response for the PDSCH.
  • the HARQ-ACK response may be composed of one bit.
  • the HARQ-ACK response may be composed of two bits if no spatial bundling is configured and one bit if spatial bundling is configured. If a HARQ-ACK transmission timing for a plurality of PDSCHs is designated as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes HARQ-ACK responses for the plurality of PDSCHs.
  • the UE may detect a PDCCH in slot #n.
  • the PDCCH includes DL scheduling information (e.g., DCI format 1_0 or 1_1).
  • DCI format 1_0 or 1_1 may include the following information.
  • the UE may then transmit a PUSCH in slot #(n+K2) according to the scheduling information in slot #n.
  • the PUSCH includes a UL-SCH TB.
  • the present disclosure proposes operation methods for the UE when PDCCH monitoring adaptation is indicated through one or more piece of DCI in various environments.
  • the UE may be configured with up to 10 search space (SS) sets per bandwidth part (BWP).
  • SS set monitoring may monitor PDCCH candidates included in the SS sets (hereinafter referred to as SS set monitoring).
  • PDCCH monitoring accounts for a significant portion of power consumption.
  • PDCCH monitoring adaptation which involves adjusting the frequency of PDCCH monitoring performed by the UE during the DRX active time to reduce power consumption.
  • PDCCH monitoring adaptation may mean an operation for reducing the frequency of PDCCH monitoring.
  • PDCCH monitoring skipping and SS set group (SSSG) switching are considered.
  • the BS may indicate information related to PDCCH monitoring adaptation to the UE using scheduling DCI (defined in Rel-16).
  • the scheduling DCI e.g., DCI format 0_1, 0_2, 1_1, or 1_2
  • the scheduling DCI may include a PDCCH monitoring adaptation indication field of up to two bits.
  • Table 3 below is an excerpt from the draft change request (CR) of RAN1#107-e.
  • [Table 3] - PDCCH monitoring adaptation indication - 0, 1 or 2 bits - 1 or 2 bits, if searchSpaceGroupIdList-r17 is not configured and if PDCCHSkippingDurationList is configured - 1 bit if the UE is configured with only one duration by PDCCHSkippingDurationList; - 2 bits if the UE is configured with more than one duration by PDCCHSkippingDurationList. - 1 or 2 bits, if PDCCHSkippingDurationList is not configured and if searchSpaceGroupIdList-r17 is configured - 2 bits, if PDCCHSkippingDurationList is configured and if searchSpaceGroupIdList-r17 is configured - 0 bit, otherwise
  • the timing for the UE to start the PDCCH monitoring adaptation operation after receiving the DCI has not yet been finalized and is still under discussion.
  • the time from when the UE receives the DCI to when the UE starts performing the PDCCH monitoring adaptation operation is referred to as an application delay.
  • the UE receives DCI indicating the PDCCH monitoring adaptation and performs the PDCCH monitoring adaptation operation after a fixed time (e.g., one or more slots) from the time the DCI is received.
  • a fixed time e.g., one or more slots
  • P_switch which is introduced for SSSG switching in the Rel-16 NR standard
  • the minimum applicable scheduling offset in the Rel-16 NR standard, or 0 slots i.e., the PDCCH monitoring adaptation is immediately applied from the time the DCI is received
  • the application delay is determined after the UE performs UL transmission in response to DCI after receiving the DCI.
  • the PDCCH monitoring adaptation may be applied after transmission of a HARQ-ACK in response to the DL DCI.
  • the PDCCH monitoring adaptation may be applied after transmission of a PUSCH scheduled by the UL DCI.
  • the UE may perform the PDCCH monitoring adaptation operation simultaneously with UL transmission according to the DCI or perform the PDCCH monitoring adaptation operation after a fixed time (e.g., P_switch) from the UL transmission.
  • a fixed time e.g., P_switch
  • the UE may require a certain period of time (i.e., application delay) until actually performing the PDCCH monitoring adaptation. However, the UE may continue to perform PDCCH monitoring during the application delay. Therefore, the UE may receive different DCI indicating the PDCCH monitoring adaptation during the application delay.
  • the PDCCH monitoring adaptation indication in the initially received DCI differs from the PDCCH monitoring adaptation indication received within the application delay, issues may arise. Additionally, when the application delay extends until HARQ-ACK transmission and the indicated PDCCH monitoring adaptation operation is applied after the HARQ-ACK transmission as described in (2), if the UE receives a plurality of pieces of DCI including the initially received DCI and the DCI received within the application delay, whether the UE performs the PDCCH monitoring adaptation operation may vary depending on the ACK/NACK in HARQ-ACK information in response to the plurality of pieces of DCI.
  • the present disclosure proposes methods for the UE to perform the PDCCH monitoring adaptation operation when the PDCCH monitoring adaptation is indicated through a plurality of pieces of DCI in Rel-17 NR.
  • the methods proposed in the present disclosure will be described based on C-DRX applied to the UE in the RRC_CONNECTED state. However, the proposed methods are not limited thereto. It may be understood by those skilled in the art that the proposed methods are also applicable to other methods in which a specific period where the UE does not need to expect reception of DL signals is capable of being defined with periodicity (e.g., DRX applied to the UE in the RRC_IDLE state).
  • the present disclosure describes the principles of the proposed methods based on the NR system, the proposed methods are not limited to NR transmission and reception formats unless otherwise specified.
  • the present disclosure provides examples based on the characteristics and structure of the UE supporting C-DRX to explain the principles of the proposed methods, the proposed methods are not limited to the UE supporting C-DRX unless otherwise specified. Therefore, the methods proposed in the present disclosure may be applied to the structure and services of all wireless communication transmission and reception unless the principles of the proposed methods are violated.
  • XR extended reality
  • XR is a concept that encompasses augmented reality (AR), virtual reality (VR), and mixed reality (MR).
  • AR augmented reality
  • VR virtual reality
  • MR mixed reality
  • the time when traffic is expected to be received is fixed by frame per second (FPS), and due to the effect of jitter, the expected reception time may be delayed or advanced.
  • the jitter of XR traffic appears as a truncated Gaussian probability distribution. Therefore, the power saving effect may be expected by periodically configuring DRX according to FPS.
  • PDCCH monitoring adaptation is configured even though no DRX is configured, the power saving effect may be expected only by the PDCCH monitoring adaptation.
  • the power saving effect may be expected by configuring both the DRX and PDCCH monitoring adaptation.
  • the expected traffic reception time and the expected reception time in consideration of the effect of jitter may be expressed as a probability, and the following embodiments are applicable to achieve the power saving effect in the XR environment as described above.
  • While the present disclosure proposes operations based on DCI reception within a DRX active time as an example, the operations may be equally applied when the UE is configured with no DRX.
  • the present disclosure describes methods of configuring UE operations when the BS transmits a plurality of pieces of DCI including PDCCH monitoring adaptation indications to the UE in the RRC_CONNECTED state and the UE receives the plurality of pieces of DCI. Accordingly, the UE may determine the application delay of the PDCCH monitoring adaptation in various environments including the Rel-17 NR environment. When the UE receives the PDCCH monitoring adaptation indication through the plurality of pieces of DCI within the application delay, the UE may perform the PDCCH monitoring adaptation operation.
  • the PDCCH monitoring adaptation operation may be used to enhance the power saving efficiency and reduce the latency in transmission and reception of control/traffic information.
  • the proposed method allows the UE to receive information related to the PDCCH monitoring adaptation from the BS.
  • the information related to the PDCCH monitoring adaptation received by the UE may include instructions for the PDCCH monitoring adaptation operation as well as UE operations upon receiving the plurality of pieces of DCI and/or UE operations indicated/configured therefor.
  • the BS may configure the PDCCH monitoring adaptation for the UE, determine/configure information related to the application delay and UE operations upon receiving the plurality of pieces of DCI, and then provide the information to the UE. Based on the information, the BS may determine to transmit a PDCCH including instructions for the PDCCH monitoring adaptation operation of the UE.
  • the proposed methods may also include processes in which the UE transmits signals and/or channels to the BS to inform the BS of the capability, preferred application delay, and/or UE operations when receiving the plurality of pieces of DCI and the BS receives the signals and/or channels.
  • FIG. 8 illustrates an overall operation process of the UE to which the proposed methods of the present disclosure are applicable.
  • the UE may report information on the capability of the UE to the BS (S801).
  • the capability information may include capability information on whether the UE is capable of supporting SSSG switching and/or PDCCH monitoring skipping.
  • the capability information may include information on an application delay preferred by the UE and information on UE operations when receiving a plurality of pieces of DCI. S801 may be omitted in specific cases (for example, when the BS already has the information or when each operation method is modified due to the needs of the BS).
  • the UE may monitor and receive a PDCCH monitoring adaptation configuration, an application delay for PDCCH monitoring adaptation, and configuration information on UE operations when indicated through the plurality of pieces of DCI (S803).
  • the configuration information may be (semi-)statically configured through the RRC layer.
  • the configuration information may include configuration information on a plurality of pieces of PDCCH monitoring adaptation.
  • a method of specifically indicating one of the configurations of the plurality of pieces of PDCCH monitoring adaptations related to DCI formats through DCI or a MAC CE/header may also be used.
  • the UE may expect a reception time of the plurality of pieces of DCI that include PDCCH monitoring adaptation indications and a related PDCCH monitoring adaptation operation mode. The UE may then receive and decode the DCI at the corresponding time (S805). The UE may perform the PDCCH monitoring adaptation operation indicated by the received DCI based on the PDCCH monitoring adaptation configuration information and then receive a PDCCH (S807).
  • the specific UE operations in S801 and S807 may be based on at least one of [Method 1] to [Method 3].
  • FIG. 9 illustrates an overall operation process of the BS to which the proposed methods of the present disclosure are applicable.
  • the BS may receive information on the capability of the UE (S901).
  • the capability information may include capability information on whether the UE is capable of supporting SSSG switching and/or PDCCH monitoring skipping.
  • the capability information may include information on an application delay preferred by the UE and information on UE operations when receiving a plurality of pieces of DCI. S901 may be omitted in specific cases (for example, when the BS already has the information or when each operation method is modified due to the needs of the BS).
  • the BS may transmit a PDCCH monitoring adaptation configuration, an application delay for PDCCH monitoring adaptation, and configuration information on UE operations when indicated through the plurality of pieces of DCI (S903).
  • the configuration information may be (semi-)statically configured through the RRC layer.
  • the configuration information may include configuration information on a plurality of pieces of PDCCH monitoring adaptation.
  • a method of specifically indicating one of the configurations of the plurality of pieces of PDCCH monitoring adaptations related to DCI formats through DCI or a MAC CE/header may also be used.
  • the specific BS operations in S901 and S907 may be based on at least one of [Method 1] to [Method 3].
  • FIG. 10 is a diagram for explaining an overall operation process of a network to which the proposed methods of the present disclosure are applicable.
  • the UE may report to the BS information on the capability of the UE to the BS (S1001).
  • the capability information may include capability information on whether the UE is capable of supporting SSSG switching and/or PDCCH monitoring skipping.
  • the capability information may include information on an application delay preferred by the UE and information on UE operations when receiving a plurality of pieces of DCI. S1001 may be omitted in specific cases (for example, when the BS already has the information or when each operation method is modified due to the needs of the BS).
  • the BS may transmit to the UE a PDCCH monitoring adaptation configuration, an application delay for PDCCH monitoring adaptation, and configuration information on UE operations when indicated through the plurality of pieces of DCI (S1003).
  • the configuration information may be (semi-)statically configured through the RRC layer.
  • the configuration information may include configuration information on a plurality of pieces of PDCCH monitoring adaptation.
  • a method of specifically indicating one of the configurations of the plurality of pieces of PDCCH monitoring adaptations related to DCI formats through DCI or a MAC CE/header may also be used.
  • the BS may transmit to the UE the plurality of pieces of DCI including PDCCH monitoring adaptation indications (S1005).
  • the BS may transmit to the UE a PDCCH based on the PDCCH monitoring adaptation operation indicated by the DCI transmitted based on the above-described PDCCH monitoring adaptation configuration information (S1007).
  • the specific BS operations in S1001 and S1007 may be based on at least one of [Method 1] to [Method 3].
  • each SSSG includes fewer SS sets than SS sets configurable for the UE in a BWP.
  • the UE is instructed to monitor only one of the two SSSGs.
  • the UE since the UE monitors fewer SS sets, compared to conventional NR UEs that monitor all SS sets configurable in the BWP, thereby resulting in power saving benefits.
  • the UE does not need to be configured with only two SSSGs. That is, three or more SSSGs may be configured depending on the configuration.
  • SSSG switching has been introduced in the Rel-16 NR standard for the purpose of shared spectrum channel access (i.e., NR-U).
  • NR-U shared spectrum channel access
  • SSSG switching has been introduced for power saving as one of the PDCCH monitoring adaptation (monitoring adaptation) operations for the UEs in the RRC_CONNECTED state that is instructed to perform DRX operation.
  • PDCCH monitoring adaptation monitoring adaptation
  • the introduction of PDCCH monitoring skipping which stops PDCCH monitoring, has been determined as another technique for PDCCH monitoring adaptation.
  • PDCCH monitoring adaptation for power saving may use up to a 2-bit field when indicated by scheduling DCI.
  • Table 4 shows configuration cases for the bit field that was agreed upon at RAN1#106bis-e.
  • Agreement (from RAN1#106bis-e)
  • Case 2 i.e., 2 SSSG switching
  • Beh The behaviors (hereinafter referred to as Beh) related to the monitoring adaptation operations of the UE regarding the aforementioned agreement have been defined as follows through previous meetings. - Beh 1: PDCCH monitoring skipping is not activated.
  • Beh 1 may not be configured depending on each case.
  • Beh 1 may be interpreted as instructing the UE not to perform any PDCCH monitoring adaptation operations.
  • a PDCCH monitoring adaptation operation that conflicts with the previously instructed operation may be indicated. For example, if a two-bit PDCCH monitoring adaptation indication field corresponds to case 3 in Table 4, there may be a case where the PDCCH monitoring adaptation field in DCI 0 first received by the UE is '01' and the PDCCH monitoring adaptation indication field in DCI 1 received during the application delay of DCI 0 is '10' as shown in FIG. 11 . Additionally, if the application delay is determined based on HARQ-ACK transmission of the UE, a NACK may occur in one or more pieces of DCI among a plurality of pieces of DCI.
  • the application delay related to a PDCCH monitoring adaptation indication included in one piece of DCI is configured in relation to the HARQ-ACK transmission, it is considered that the PDCCH monitoring adaptation indication is not performed in the case of NACK transmission. Therefore, it is necessary to define UE operations when a NACK occurs only some of the plurality of pieces of DCI.
  • the methods proposed in the present disclosure will be described based on that a PDCCH monitoring adaptation indication in scheduling DCI is related to HARQ-ACK transmission, but the methods are not limited thereto. In other words, the proposed methods may also be applied to cases where a specific instruction through DCI and the timing of executing the instruction are related to HARQ-ACK transmission, in addition to the PDCCH monitoring adaptation indication.
  • receiving a plurality of pieces of DCI including PDCCH monitoring adaptation indications means that the plurality of pieces of DCI are received at the same time (e.g., within the same slot) or after reception of a first piece of DCI, another piece of DCI is received within the application delay of a PDCCH monitoring adaptation indication in the first piece of DCI.
  • the DCI containing the PDCCH monitoring adaptation indication first received by the UE is referred to as DCI 0.
  • DCI x may refer to one or more of pieces of DCI.
  • the definition of DCI x is as follows.
  • the definition of DCI x may vary depending on the starting point of the application delay of the PDCCH monitoring adaptation indication. In other words, one definition may naturally be selected based on the application delay.
  • FIGS. 11(a) and 11(b) illustrate examples of ACK/NACK transmission for a plurality of pieces of DCI.
  • D denotes a downlink slot
  • U denotes an uplink slot.
  • K0 which represents the interval between DCI and a PDSCH
  • K1 which represents the interval between the PDSCH scheduled by the DCI and a HARQ-ACK
  • K1 may be understood as indicating the interval between the DCI and HARQ-ACK.
  • operations according to [Method 1-1] and/or [Method 1-2] described in the present disclosure as well as the execution of the operations according to [Method 1-1] and/or [Method 1-2] may be preconfigured or instructed by the BS to the UE through higher layer signaling, DCI, and/or a MAC CE.
  • DCI 0 When the earliest DCI among a plurality of pieces of DCI received by the UE that includes a PDCCH monitoring adaptation indication is referred to as DCI 0, one or more pieces of DCI x may be received within the application delay of DCI 0.
  • the BS may configure the PDCCH monitoring adaptation indication included in DCI 0 to always be the same as the PDCCH monitoring adaptation indication included in DCI x.
  • the bit value of the PDCCH monitoring adaptation field indicated by DCI 0 may always be the same as the bit value of the PDCCH monitoring adaptation indication field in DCI x received by the UE during the application delay of DCI 0.
  • [Method 1-1] may be beneficial in terms of decoding of DCI.
  • DCI is encoded/decoded using polar codes.
  • the field value of the PDCCH monitoring adaptation indication is obtained by receiving DCI 0, it is possible to know in advance up to two-bit information corresponding to the PDCCH monitoring adaptation indication field among the information bits of DCI x, which is not DCI 0.
  • the UE may consider some of the information bits of the polar code (for example, up to two bits corresponding to the PDCCH monitoring adaptation indication field) as frozen bits, thereby reducing the code rate of the corresponding DCI from the perspective of the UE.
  • the UE may perform DCI decoding more easily.
  • the UE may lower the code rate of DCI 0 by checking the bits of the PDCCH monitoring adaptation indication field in subsequent DCI x and then attempt to decode DCI 0 again.
  • the UE may ensure the robustness of DCI reception.
  • [Method 1-1] may involve repeatedly transmitting the same bit values, it may result in some degree of resource wastage.
  • PDCCH monitoring adaptation indication in DCI 0 and PDCCH monitoring adaptation indication in DCI x may be different.
  • the UE may receive one or more pieces of DCI x within the application delay of DCI 0.
  • the BS may consider cases where the PDCCH monitoring adaptation indication in DCI 0 and the PDCCH monitoring adaptation indication in DCI x are different.
  • the bit value of the PDCCH monitoring adaptation indication field indicated by the BS through DCI 0 may be different from the bit value of the PDCCH monitoring adaptation indication field of DCI x received by the UE during the application delay of DCI 0.
  • the UE may operate according to the PDCCH monitoring adaptation indication of DCI x. If there are a plurality of pieces of DCI x, the UE may operate according to the PDCCH monitoring adaptation indication of DCI x received last in time. This allows the BS to cancel or modify the PDCCH monitoring adaptation operation previously instructed to the UE. In other words, the flexibility of the PDCCH monitoring adaptation indication transmitted by the BS to the UE may be expected.
  • the UE may expect that the PDCCH monitoring adaptation indications of DCI received at the same time will always be the same.
  • the term “same time” may mean receiving a plurality of pieces of DCI within the same slot.
  • the “same time” may refer to receiving a plurality of pieces of DCI within K0 slots from the timing of receiving DCI 0 (if K0 is not 0). For example, even if the UE receives DCI at different times, if the decoding time is the same, it may be considered as receiving the DCI at the same time.
  • K0 is configured considering the time required for decoding DCI and the decoding time of the DCI, if K0 is configured such that DCI received within K0 slots from the timing of receiving DCI 0 (if K0 is not 0) are decoded at the same time as DCI 0, the DCI may be regarded as being received at the same time as DCI 0.
  • the flexibility in PDCCH monitoring adaptation operations which the BS is capable of instructing to the UE, may be expected as described above. Even if the BS instructs a PDCCH monitoring adaptation operation through DCI 0, the UE may suddenly have data that needs to be transmitted.
  • [Method 1-2] has an advantage of capable of invalidating a previous PDCCH monitoring adaptation operation and instruct a new PDCCH monitoring adaptation operation for the UE through a new PDCCH monitoring adaptation indication.
  • the PDCCH monitoring adaptation operation actually performed by the UE may not match the operation expected by the BS.
  • the intention behind configuring the application delay of SSSG switching after a HARQ-ACK/PUSCH is to prevent the misalignment between an SSSG where the BS expects the UE to perform PDCCH monitoring and an SSSG where the UE actually performs monitoring, [Method 1-2] may conflict with the intended purpose of the above operation.
  • the UE identifies in advance PUCCH resources for transmitting a HARQ-ACK for DCI including PDCCH monitoring adaptation indications and informs the BS of the DCI indicating the PDCCH monitoring adaptation performed by the UE using the PUCCH resources. For example, if the UE operates according to the PDCCH monitoring adaptation indicated by DCI 0, the UE may transmit HARQ-ACKs for both DCI 0 and DCI x on PUCCH resource #0 associated with DCI 0.
  • Method 2 UE operations upon receiving plurality of pieces of PDCCH monitoring adaptation through plurality of pieces of DCI when application delay of PDCCH monitoring adaptation indication is configured in relation to HARQ-ACK transmission
  • the same point in time for a plurality of pieces of DCI may start simultaneously with UL transmission of the UE, such as HARQ-ACK transmission or PUSCH transmission, or the same point in time may start after a specific time has elapsed after the UL transmission of the UE.
  • [Method 2] of the present disclosure the application delay related to ACK or NACK transmission for DL DCI and methods of applying PDCCH monitoring adaptation will be described.
  • the present disclosure is described based on the above example; however, in the case of UL DCI, ACK transmission may be replaced by PUSCH transmission, and NACK transmission may be replaced by skipping PUSCH transmission.
  • [Method 2-1], [Method 2-2], and [Method 2-3] will be described on the assumption of [Method 1-1]. That is, [Method 2-1], [Method 2-2], and [Method 2-3] will be described by assuming that the PDCCH monitoring adaptation indications of DCI are the same.
  • a PDCCH monitoring adaptation indication that the UE performs in [Method 2-1], [Method 2-2], and/or [Method 2-3] may be a PDCCH monitoring adaptation indication of DCI received at the latest point in time.
  • UE performs PDCCH monitoring adaptation indications only if UE transmits ACKs for all plurality of pieces of DCI including PDCCH monitoring adaptation indications.
  • the UE performs a PDCCH monitoring adaptation indication only if the UE transmits ACKs for DCI 0 and at least one piece of DCI x received within the application delay.
  • PDCCH monitoring adaptation indications that the UE does not perform may be based on retransmitted DCI (hereinafter referred to as DCI x+1) related to PDSCH reception where the NACK occurs.
  • the UE may be expected to monitor a PDCCH according to the PDCCH monitoring adaptation indication included in DCI rescheduling the PDSCH scheduled by the third DCI.
  • the UE may be expected to monitor the PDCCH according to the PDCCH monitoring adaptation indication included in the latest received DCI among rescheduling DCI for the plurality of pieces of DCI.
  • the UE may be expected to monitor the PDCCH according to the PDCCH monitoring adaptation indication included in the rescheduling DCI corresponding to the latest received DCI among the plurality of pieces of DCI where the NACKs occur.
  • the UE may be expected that all rescheduling DCI for the plurality of pieces of DCI corresponding to the NACK include the same PDCCH monitoring adaptation indication.
  • the PDCCH monitoring adaptation indication field configurations may be the same, but for different DCI formats, the PDCCH monitoring adaptation indication field configurations may vary.
  • the PDCCH monitoring adaptation indication field may be two bits, but in DCI format 1_2, the PDCCH monitoring adaptation indication field may be zero bits. In other words, the PDCCH monitoring adaptation indication field may not be configured in DCI format 1_2. In such cases, DCI 0 and DCI x may have DCI format 1_1, but DCI x+1 for retransmission may be transmitted in DCI format 1_2. In this case, the PDCCH monitoring adaptation indication field is not configured in DCI x+1 for retransmission. Therefore, the PDCCH monitoring adaptation indications in previous DCI 0 and DCI x may be performed based on a new point in time, which is the ACK transmission time for DCI x+1.
  • the PDCCH monitoring adaptation indication field may be configured in DCI x+1 for retransmission.
  • the UE may ignore the PDCCH monitoring adaptation indications in previous DCI 0 and DCI x and operate according to the PDCCH monitoring adaptation indication in DCI x+1. This is because since the BS already receives the ACK/NACK for DCI 0 and DCI x, the BS may need to transmit a new PDCCH monitoring adaptation indication in consideration of a changed data transmission situation or the buffering of the UE.
  • Method 2-2 UE performs PDCCH monitoring operation according to PDCCH monitoring adaptation indication only if UE transmits at least one ACK for plurality of pieces of DCI including PDCCH monitoring adaptation indications.
  • the UE performs PDCCH monitoring according to a PDCCH monitoring adaptation indication only if the UE transmits at least one ACK for DCI 0 and at least one DCI x received within the application delay.
  • the UE does not perform PDCCH monitoring according to the PDCCH monitoring adaptation indication only if NACKs occurs for all of a plurality of pieces of DCI.
  • PDCCH monitoring adaptation indications that the UE does not perform may be based on retransmission DCI (hereinafter referred to as DCI x+1) related to PDSCH reception where the NACK occurs as described in [Method 2-1].
  • the UE since the UE does not perform PDCCH monitoring adaptation only if all NACKs occur, the UE may be expected to monitor a PDCCH according to the PDCCH monitoring adaptation indication included in latest received DCI x+1 among all pieces of DCI x+1 corresponding to NACKs. Alternatively, the UE may be expected to monitor the PDCCH according to the PDCCH monitoring adaptation indication included in DCI x+1 corresponding to latest received DCI x. Alternatively, the UE may be expected that all pieces of DCI x+1 include the same PDCCH monitoring adaptation indication.
  • the PDCCH monitoring adaptation indication field configurations may be the same, but for different DCI formats, the PDCCH monitoring adaptation indication field configurations may vary.
  • the PDCCH monitoring adaptation indication field may be two bits, but in DCI format 1_2, the PDCCH monitoring adaptation indication field may be zero bits. In other words, the PDCCH monitoring adaptation indication field may not be configured in DCI format 1_2. In such cases, DCI 0 and DCI x may have DCI format 1_1, but DCI x+1 for retransmission may be transmitted in DCI format 1_2. In this case, the PDCCH monitoring adaptation indication field is not configured in DCI x+1 for retransmission. Therefore, the PDCCH monitoring adaptation indications in previous DCI 0 and DCI x may be performed based on a new point in time, which is the ACK transmission time for DCI x+1.
  • the PDCCH monitoring adaptation indication field may be configured in DCI x+1 for retransmission.
  • the UE may ignore the PDCCH monitoring adaptation indications in previous DCI 0 and DCI x and operate according to the PDCCH monitoring adaptation indication in DCI x+1. This is because since the BS already receives the ACK/NACK for DCI 0 and DCI x, the BS may need to transmit a new PDCCH monitoring adaptation indication in consideration of a changed data transmission situation or the buffering of the UE.
  • the detailed operations of the UE may vary depending on whether the PDCCH monitoring operation is performed simultaneously with ACK transmission or after a certain period of time following ACK transmission. If the SSSG switching is performed simultaneously with the ACK transmission, retransmission of a PDSCH corresponding to the NACK may be carried out by performing SS set monitoring in an SSSG after the switching. If the PDCCH monitoring adaptation operation is performed after a certain time (T, for example, P_switch) following the ACK transmission, the UE may monitor a PDCCH and receive DCI during the interval T between the ACK transmission and the PDCCH monitoring adaptation operation.
  • T for example, P_switch
  • the BS may consider T when transmitting DCI after the UE performs the ACK transmission. For example, if the BS transmits DCI for retransmission or DCI for new transmission within T after receiving the ACK, the UE may not properly receive the DCI if there is a transmission delay or if T is short. Thus, it may be considered for the BS to transmit the DCI in consideration of T after the UE transmits the ACK.
  • the BS transmits DCI in an SS set included in SSSG#0, but the UE changes the monitoring target to an SS set included in SSSG#1 and thus fails to properly receive the DCI transmitted by the BS.
  • a method by which the BS selects an SS set included in both an SSSG before switching and an SSSG after the switching and then transmits DCI may be considered.
  • a method by which the BS delays DCI transmission during T and then transmits the DCI after the UE completes SSSG switching may be considered.
  • Embodiment 1 may require the application of [Method 2-1].
  • the UE may be instructed to perform SSSG switching, and an SSSG after the switching may be an SSSG that does not include any SS set (e.g., empty SSSG). This may correspond to '1' of case 2 or '01' or ⁇ 10' of case 3 among the configurations of the aforementioned PDCCH monitoring adaptation indication field.
  • a PDCCH monitoring skipping indication may correspond to Embodiment 1 regardless of a PDCCH monitoring skipping duration.
  • Embodiment 1 may correspond to a case where the UE has no SS set to monitor during a certain period of time (e.g., PDCCH monitoring skipping duration or duration of monitoring the empty SSSG) after performing the PDCCH monitoring adaptation indication.
  • PDCCH monitoring skipping duration or duration of monitoring the empty SSSG e.g., PDCCH monitoring skipping duration or duration of monitoring the empty SSSG
  • the UE needs to perform the retransmission procedure after the end of PDCCH monitoring adaptation, which may cause latency issues for both the UE and BS. Therefore, in the case of Embodiment 1, if at least one NACK occurs for a plurality of pieces of DCI, the UE may be configured to performing the indicated PDCCH monitoring adaptation operation after completing the retransmission procedure.
  • a PDCCH monitoring skipping operation that terminates the current DRX cycle of the UE may be considered.
  • the UE may be configured to wait until a retransmission timer for the retransmission procedure expires (i.e., until the retransmission procedure is completed) and then perform the indicated PDCCH monitoring adaptation operation after the retransmission timer has expired.
  • Embodiment 2 may require the application of [Method 2-2].
  • the UE may be instructed to perform SSSG switching, and an SSSG after the switching may include one or more SS sets. This may correspond to '0' of case 2, ⁇ 00' of case 3, or '01'/'10' of case 3 when there is no empty SSSG among the configurations of the aforementioned PDCCH monitoring adaptation indication field.
  • Embodiment 2 may correspond to a case where the UE has one or more SS sets to monitor during a certain period of time after performing the PDCCH monitoring adaptation indication. As described above in [Method 2-2], if the indicated PDCCH monitoring adaptation operation is not performed, it may correspond to a case where NACKs occur for all of a plurality of pieces of DCI. Thus, the UE may determine that there is an issue with the channel or beam.
  • Embodiment 3 may require the application of [Method 2-1]. Since the same method needs to be applied for any PDCCH monitoring adaptation operations, [Method 2-1] capable of considering both PDCCH monitoring skipping and empty SSSG switching may be applicable.
  • the time at which the UE applies the PDCCH monitoring adaptation operation may differ.
  • the time of transmitting HARQ-ACKs for some pieces of DCI including DCI 0 may be different from the time of transmitting HARQ-ACKs for DCI x received within the application delay of DCI 0.
  • the UE may be configured/instructed to apply an indicated PDCCH monitoring adaptation based on either the time of transmitting HARQ-ACK for DCI 0 or the time of transmitting the HARQ-ACK for DCI x, which is received later in time.
  • the application time of the PDCCH monitoring adaptation operation may be determined based on the ACK transmission time for DCI x to apply [Method 2-1].
  • the PDCCH monitoring adaptation may be performed based on the ACK transmission time for DCI 0, and the detailed operation may be performed according to [Method 2-2].
  • UE determines whether to perform PDCCH monitoring adaptation operation according to [Method 2-1] or [Method 2-2] and then performs PDCCH monitoring operation based on PDCCH monitoring adaptation indication of most recently received DCI.
  • the UE When the PDCCH monitoring adaptation is indicated through a plurality of pieces of DCI, whether the UE performs the PDCCH monitoring adaptation operation may be determined according to [Method 2-1] or [Method 2-2]. If the UE determines to perform the PDCCH monitoring adaptation operation according to [Method 2-1] or [Method 2-2], the UE may monitor a PDCCH according to the PDCCH monitoring adaptation indication included in the most recently received DCI among the plurality of pieces of DCI, which may include different PDCCH monitoring adaptation operations.
  • the most recently received DCI may be the last received DCI corresponding to ACK transmission described in [Method 2-1] and [Method 2-2].
  • the UE may receive a plurality of pieces of DCI including PDCCH monitoring adaptation indications, which may be different from each other, in the first to fourth downlink slots and perform ACK transmission for the plurality of pieces of DCI in uplink slots.
  • the BS configures/indicates in advance the time of transmitting the DCI including the PDCCH monitoring adaptation indication, which the UE needs to follow, the UE may operate smoothly even if the plurality of pieces of DCI indicates different pieces of PDCCH monitoring adaptations.
  • the BS may configure/instruct the UE to operate according to the PDCCH monitoring adaptation indication in DCI 0 or the PDCCH monitoring adaptation indication in latest DCI x in time. This may be based on [Method 1-2],
  • the UE may expect that the same PDCCH monitoring adaptation will be always indicated according to [Method 1-1].
  • the application delay is configured in relation to the DCI reception time, even the same PDCCH monitoring adaptation indication may have different starting points for applying the PDCCH monitoring adaptation operation.
  • both DCI 0 and DCI x may indicate PDCCH monitoring skipping for 5 slots, but due to the difference in the reception times of DCI 0 and DCI x, the starting points at which the UE actually performs the PDCCH monitoring adaptation operation may differ. Therefore, the BS may configure/indicated in advance to the UE whether the reference for determining the starting point of the PDCCH monitoring adaptation operation is DCI 0 or DCI x.
  • PDCCH monitoring skipping may be applied separately for each PDCCH monitoring skipping indication. For example, a plurality of PDCCH monitoring durations (e.g., two or three PDCCH monitoring durations) may be indicated, and the UE operations may be differentiated based on the length of the indicated PDCCH monitoring skipping duration. In other words, if the end point of the PDCCH monitoring skipping indicated by DCI 0 is t1 and the end point of the PDCCH monitoring skipping indicated by DCI x is t2, the UE operations may be differentiated based on the value of t1 and t2.
  • the BS may configure the UE to follow either the PDCCH monitoring adaptation indication of DCI 0 or the PDCCH monitoring adaptation indication of DCI x. If the UE follows the PDCCH monitoring adaptation indication of DCI 0, the BS may expect power saving benefits for the UE. On the other hand, if the UE follows the PDCCH monitoring adaptation indication of DCI x, the BS may expect the benefit of minimizing latency for the UE.
  • the BS may configure the UE to follow either the PDCCH monitoring adaptation indication of DCI 0 or the PDCCH monitoring adaptation indication of DCI x. If the UE follows the PDCCH monitoring adaptation indication of DCI 0, the BS may expect the benefit of minimizing latency for the UE. On the other hand, if the UE follows the PDCCH monitoring adaptation indication of DCI x, the BS may expect power saving benefits for the UE.
  • the UE When PDCCH monitoring skipping is indicated by scheduling DCI, if the UE successfully receives the DCI but fails to receive a PDSCH scheduled by the DCI, the UE may be configured to receive retransmission scheduling DCI and a retransmitted PDSCH after the PDCCH monitoring skipping duration indicated by the DCI.
  • FIG. 12 illustrates a communication system 1 applied to the present disclosure.
  • the communication system 1 applied to the present disclosure includes wireless devices, BSs, and a network.
  • a wireless device is a device performing communication using radio access technology (RAT) (e.g., 5G NR (or New RAT) or LTE), also referred to as a communication/radio/5G device.
  • RAT radio access technology
  • the wireless devices may include, not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device/server 400.
  • RAT radio access technology
  • XR extended reality
  • AI artificial intelligence
  • the vehicles may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of vehicle-to-vehicle (V2V) communication.
  • the vehicles may include an unmanned aerial vehicle (UAV) (e.g., a drone).
  • UAV unmanned aerial vehicle
  • the XR device may include an augmented reality (AR)/virtual reality (VR)/mixed reality (MR) device and may be implemented in the form of a head-mounted display (HMD), a head-up display (HUD) mounted in a vehicle, a television (TV), a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and so on.
  • AR augmented reality
  • VR virtual reality
  • MR mixeded reality
  • the hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or smartglasses), and a computer (e.g., a laptop).
  • the home appliance may include a TV, a refrigerator, a washing machine, and so on.
  • the IoT device may include a sensor, a smartmeter, and so on.
  • the BSs and the network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS/network node for other wireless devices.
  • the wireless devices 100a to 100f may be connected to the network 300 via the BSs 200.
  • An AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300.
  • the network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network.
  • the wireless devices 100a to 100f may communicate with each other through the BSs 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without intervention of the BSs/network.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g.
  • V2V/vehicle-to-everything (V2X) communication may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.
  • Wireless communication/connections 150a, 150b, and 150c may be established between the wireless devices 100a to 100fBS 200 and between the BSs 200.
  • the wireless communication/connections may be established through various RATs (e.g., 5GNR) such as UL/DL communication 150a, sidelink communication 150b (or, D2D communication), or inter-BS communication (e.g. relay or integrated access backhaul (IAB)).
  • RATs e.g., 5GNR
  • Wireless signals may be transmitted and received between the wireless devices, between the wireless devices and the BSs, and between the BSs through the wireless communication/connections 150a, 150b, and 150c.
  • signals may be transmitted and receive don various physical channels through the wireless communication/connections 150a, 150b and 150c.
  • various configuration information configuring processes various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocation processes, for transmitting/receiving wireless signals, may be performed based on the various proposals of the present disclosure.
  • various signal processing processes e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping
  • resource allocation processes for transmitting/receiving wireless signals
  • FIG. 13 illustrates wireless devices applicable to the present disclosure.
  • a first wireless device 100 and a second wireless device 200 may transmit wireless signals through a variety of RATs (e.g., LTE and NR).
  • RATs e.g., LTE and NR
  • the first wireless device 100 and the second wireless device 200 ⁇ may correspond to ⁇ the wireless device 100x and the BS 200 ⁇ and/or ⁇ the wireless device 100x and the wireless device 100x ⁇ of FIG. 12 .
  • the first wireless device 100 may include one or more processors 102 and one or more memories 104, and further include one or more transceivers 106 and/or one or more antennas 108.
  • the processor(s) 102 may control the memory(s) 104 and/or the transceiver(s) 106 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document.
  • the processor(s) 102 may process information in the memory(s) 104 to generate first information/signals and then transmit wireless signals including the first information/signals through the transceiver(s) 106.
  • the processor(s) 102 may receive wireless signals including second information/signals through the transceiver(s) 106 and then store information obtained by processing the second information/signals in the memory(s) 104.
  • the memory(s) 104 may be connected to the processor(s) 102 and may store various pieces of information related to operations of the processor(s) 102.
  • the memory(s) 104 may store software code including instructions for performing all or a part of processes controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document.
  • the processor(s) 102 and the memory(s) 104 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR).
  • the transceiver(s) 106 may be connected to the processor(s) 102 and transmit and/or receive wireless signals through the one or more antennas 108.
  • Each of the transceiver(s) 106 may include a transmitter and/or a receiver.
  • the transceiver(s) 106 may be interchangeably used with radio frequency (RF) unit(s).
  • the wireless device may be a communication modem/circuit/chip.
  • the processor(s) 102 may be a computer-readable storage medium and store instructions or programs.
  • the instructions or programs may cause, when executed, the at least one processor operably connected to the at least one memory to perform operations according to Embodiments or implementations of the present disclosure, related to the following operations.
  • the processor(s) 102 may report capability information on the capability of the processor(s) 102 to the BS.
  • the capability information may include information capability information on whether the processor(s) 102 are capable of supporting SSSG switching and/or PDCCH monitoring skipping.
  • the capability information may include information on an application delay preferred by the processor(s) 102 and information on the operations of the processor(s) 102 when receiving a plurality of pieces of DCI.
  • the process for reporting the capability information may be omitted in specific cases (for example, when the BS already has the information or when each operation method is modified due to the needs of the BS).
  • the processor(s) 102 may monitor and receive a PDCCH monitoring adaptation configuration, an application delay for PDCCH monitoring adaptation, and configuration information on UE operations when indicated through the plurality of pieces of DCI through the transceiver(s) 106.
  • the configuration information may be (semi-)statically configured through the RRC layer.
  • the configuration information may include configuration information on a plurality of pieces of PDCCH monitoring adaptation.
  • a method of specifically indicating one of the configurations of the plurality of pieces of PDCCH monitoring adaptations related to DCI formats through DCI or a MAC CE/header may also be used.
  • the processor(s) 102 may expect a reception time of the plurality of pieces of DCI that include PDCCH monitoring adaptation indications and a related PDCCH monitoring adaptation operation mode.
  • the processor(s) 102 may receive the DCI at the corresponding time through the transceiver(s) 106 and then decode the DCI.
  • the processor(s) 102 may perform the PDCCH monitoring adaptation operation indicated by the received DCI based on the PDCCH monitoring adaptation configuration information and then receive a PDCCH.
  • processor(s) 102 may be based on at least one of [Method 1] to [Method 3].
  • the second wireless device 200 may include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and/or one or more antennas 208.
  • the processor(s) 202 may control the memory(s) 204 and/or the transceiver(s) 206 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document.
  • the processor(s) 202 may process information in the memory(s) 204 to generate third information/signals and then transmit wireless signals including the third information/signals through the transceiver(s) 206.
  • the processor(s) 202 may receive wireless signals including fourth information/signals through the transceiver(s) 106 and then store information obtained by processing the fourth information/signals in the memory(s) 204.
  • the memory(s) 204 may be connected to the processor(s) 202 and store various pieces of information related to operations of the processor(s) 202.
  • the memory(s) 204 may store software code including instructions for performing all or a part of processes controlled by the processor(s) 202 or for performing the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document.
  • the processor(s) 202 and the memory(s) 204 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR).
  • the transceiver(s) 206 may be connected to the processor(s) 202 and transmit and/or receive wireless signals through the one or more antennas 208.
  • Each of the transceiver(s) 206 may include a transmitter and/or a receiver.
  • the transceiver(s) 206 may be interchangeably used with RF unit(s).
  • the wireless device may be a communication modem/circuit/chip.
  • the processor(s) 202 may be a computer-readable storage medium and store instructions or programs.
  • the instructions or programs may cause, when executed, the at least one processor operably connected to the at least one memory to perform operations according to Embodiments or implementations of the present disclosure, related to the following operations.
  • the processor(s) 202 may receive information on the capability of the UE through the transceiver(s) 206.
  • the capability information may include capability information on whether the UE is capable of supporting SSSG switching and/or PDCCH monitoring skipping.
  • the capability information may include information on an application delay preferred by the UE and information on UE operations when receiving a plurality of pieces of DCI. S901 may be omitted in specific cases (for example, when the processor(s) 202 already has the information or when each operation method is modified due to the needs of the processor(s) 202).
  • the processor(s) 202 may transmit a PDCCH monitoring adaptation configuration, an application delay for PDCCH monitoring adaptation, and configuration information on UE operations when indicated through the plurality of pieces of DCI through the transceiver(s) 206.
  • the configuration information may be (semi-)statically configured through the RRC layer.
  • the configuration information may include configuration information on a plurality of pieces of PDCCH monitoring adaptation.
  • a method of specifically indicating one of the configurations of the plurality of pieces of PDCCH monitoring adaptations related to DCI formats through DCI or a MAC CE/header may also be used.
  • the processor(s) 202 may transmit the plurality of pieces of DCI including PDCCH monitoring adaptation indications through the transceiver(s) 206.
  • the processor(s) 202 may transmit a PDCCH based on the PDCCH monitoring adaptation operation indicated by the DCI transmitted based on the above-described PDCCH monitoring adaptation configuration information through the transceiver(s) 206.
  • processor(s) 202 may be based on at least one of [Method 1] to [Method 3].
  • One or more protocol layers may be implemented by, not limited to, one or more processors 102 and 202.
  • the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY), medium access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), RRC, and service data adaptation protocol (SDAP)).
  • the one or more processors 102 and 202 may generate one or more protocol data units (PDUs) and/or one or more service data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document.
  • PDUs protocol data units
  • SDUs service data Units
  • the one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document and provide the messages, control information, data, or information to one or more transceivers 106 and 206.
  • the one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document and provide the generated signals to the one or more transceivers 106 and 206.
  • the one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document.
  • signals e.g., baseband signals
  • the one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers.
  • the one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include the modules, procedures, or functions.
  • Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document may be included in the one or more processors 102 and 202 or may be stored in the one or more memories 104 and 204 and executed by the one or more processors 102 and 202.
  • the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of code, an instruction, and/or a set of instructions.
  • the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands.
  • the one or more memories 104 and 204 may be configured to include read-only memories (ROMs), random access memories (RAMs), electrically erasable programmable read-only memories (EPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and/or combinations thereof.
  • the one or more memories 104 and 204 may be located at the interior and/or exterior of the one or more processors 102 and 202.
  • the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.
  • the one or more transceivers 106 and 206 may transmit user data, control information, and/or wireless signals/channels, mentioned in the methods and/or operation flowcharts of this document, to one or more other devices.
  • the one or more transceivers 106 and 206 may receive user data, control information, and/or wireless signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document, from one or more other devices.
  • the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive wireless signals.
  • the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or wireless signals to one or more other devices.
  • the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or wireless signals from one or more other devices.
  • the one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208 and the one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and/or wireless signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operation flowcharts disclosed in this document, through the one or more antennas 108 and 208.
  • the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).
  • the one or more transceivers 106 and 206 may convert received wireless signals/channels from RF band signals into baseband signals in order to process received user data, control information, and wireless signals/channels using the one or more processors 102 and 202.
  • the one or more transceivers 106 and 206 may convert the user data, control information, and wireless signals/channels processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals.
  • the one or more transceivers 106 and 206 may include (analog) oscillators and/or filters.
  • FIG. 14 illustrates a vehicle or an autonomous driving vehicle applied to the present disclosure.
  • the vehicle or autonomous driving vehicle may be implemented as a mobile robot, a car, a train, a manned/unmanned aerial vehicle (AV), a ship, or the like.
  • AV manned/unmanned aerial vehicle
  • a vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d.
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • the communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and road side units), and servers.
  • the control unit 120 may perform various operations by controlling elements of the vehicle or the autonomous driving vehicle 100.
  • the control unit 120 may include an ECU.
  • the driving unit 140a may enable the vehicle or the autonomous driving vehicle 100 to drive on a road.
  • the driving unit 140a may include an engine, a motor, a powertrain, a wheel, a brake, a steering device, and so on.
  • the power supply unit 140b may supply power to the vehicle or the autonomous driving vehicle 100 and include a wired/wireless charging circuit, a battery, and so on.
  • the sensor unit 140c may acquire information about a vehicle state, ambient environment information, user information, and so on.
  • the sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward/backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, and so on.
  • IMU inertial measurement unit
  • the autonomous driving unit 140d may implement technology for maintaining a lane on which the vehicle is driving, technology for automatically adjusting speed, such as adaptive cruise control, technology for autonomously driving along a determined path, technology for driving by automatically setting a route if a destination is set, and the like.
  • the communication unit 110 may receive map data, traffic information data, and so on from an external server.
  • the autonomous driving unit 140d may generate an autonomous driving route and a driving plan from the obtained data.
  • the control unit 120 may control the driving unit 140a such that the vehicle or autonomous driving vehicle 100 may move along the autonomous driving route according to the driving plan (e.g., speed/direction control).
  • the communication unit 110 may aperiodically/periodically acquire recent traffic information data from the external server and acquire surrounding traffic information data from neighboring vehicles.
  • the sensor unit 140c may obtain information about a vehicle state and/or surrounding environment information.
  • the autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly obtained data/information.
  • the communication unit 110 may transfer information about a vehicle position, the autonomous driving route, and/or the driving plan to the external server.
  • the external server may predict traffic information data using AI technology based on the information collected from vehicles or autonomous driving vehicles and provide the predicted traffic information data to the vehicles or the autonomous driving vehicles.
  • FIG. 15 illustrates an XR device applicable to the present disclosure.
  • the XR device may be implemented as an HMD, a head-up display (HUD) in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, and so on.
  • HMD head-up display
  • FIG. 15 illustrates an XR device applicable to the present disclosure.
  • the XR device may be implemented as an HMD, a head-up display (HUD) in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, and so on.
  • HUD head-up display
  • an XR device 100a may include a communication unit 110, a control unit 120, a memory unit 130, an input/output (I/O) unit 140a, a sensor unit 140b, and a power supply unit 140c.
  • I/O input/output
  • the communication unit 110 may transmit and receive signals (e.g., media data and control signals) to and from external devices such as other wireless devices, handheld devices, or media servers.
  • the media data may include video, images, and sound.
  • the control unit 120 may perform various operations by controlling constituent elements of the XR device 100a.
  • the control unit 120 may be configured to control and/or perform procedures such as video/image acquisition, (video/image) encoding, and metadata generation and processing.
  • the memory unit 130 may store data/parameters/programs/code/instructions needed to drive the XR device 100a and/or generate an XR object.
  • the I/O unit 140a may obtain control information and data from the exterior and output the generated XR object.
  • the I/O unit 140a may include a camera, a microphone, a user input unit, a display unit, a speaker, and/or a haptic module.
  • the sensor unit 140b may obtain an XR device state, surrounding environment information, user information, etc.
  • the sensor unit 140b may include a proximity sensor, an illumination sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, a light sensor, a microphone, and/or a radar.
  • the power supply unit 140c may supply power to the XR device 100a and include a wired/wireless charging circuit, a battery, etc.
  • the memory unit 130 of the XR device 100a may include information (e.g., data) needed to generate the XR object (e.g., an AR/VR/MR object).
  • the I/O unit 140a may receive a command for manipulating the XR device 100a from a user and the control unit 120 may drive the XR device 100a according to a driving command of a user. For example, when a user desires to watch a film or news through the XR device 100a, the control unit 120 may transmit content request information to another device (e.g., a handheld device 100b) or a media server through the communication unit 130.
  • the communication unit 130 may download/stream content such as films or news from another device (e.g., the handheld device 100b) or the media server to the memory unit 130.
  • the control unit 120 may control and/or perform procedures such as video/image acquisition, (video/image) encoding, and metadata generation/processing with respect to the content and generate and/or output the XR object based on information about a surrounding space or a real object obtained through the I/O unit 140a and/or the sensor unit 140b.
  • the XR device 100a may be wirelessly connected to the handheld device 100b through the communication unit 110 and the operation of the XR device 100a may be controlled by the handheld device 100b.
  • the handheld device 100b may operate as a controller of the XR device 100a.
  • the XR device 100a may obtain information about a 3D position of the handheld device 100b and generate and output an XR object corresponding to the handheld device 100b.
  • Embodiments of the present disclosure described herein below are combinations of elements and features of the present disclosure.
  • the elements or features may be considered selective unless otherwise mentioned.
  • Each element or feature may be practiced without being combined with other elements or features.
  • an Embodiment of the present disclosure may be constructed by combining parts of the elements and/or features. Operation orders described in Embodiments of the present disclosure may be rearranged. Some constructions of any one Embodiment may be included in another Embodiment and may be replaced with corresponding constructions of another Embodiment. It will be obvious to those skilled in the art that claims that are not explicitly cited in each other in the appended claims may be presented in combination as an Embodiment of the present disclosure or included as a new claim by a subsequent amendment after the application is filed.
  • a specific operation described as performed by the BS may be performed by an upper node of the BS in some cases. Namely, it is apparent that, in a network comprised of a plurality of network nodes including a BS, various operations performed for communication with an MS may be performed by the BS, or network nodes other than the BS.
  • the term ⁇ BS' may be replaced with the term ⁇ fixed station', ⁇ Node B', ⁇ enhanced Node B (eNode B or eNB)', ⁇ access point', etc.
  • the method of transmitting and receiving a downlink control channel and apparatus therefor have been described mainly based on the fifth generation (5G) new radio access technology (RAT) system, but the method and apparatus are also applicable to various wireless communication systems including the 5G new RAT system.
  • 5G fifth generation
  • RAT radio access technology

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  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
EP23740446.2A 2022-01-11 2023-01-11 Verfahren zum senden und empfangen eines downlink-steuerkanals und vorrichtung dafür Pending EP4465731A4 (de)

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PCT/KR2023/000502 WO2023136602A1 (ko) 2022-01-11 2023-01-11 하향링크 제어 채널을 송수신하는 방법 및 이를 위한 장치

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